OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY3PNA060090NA

This is the factory OEM Direct Spark Ignition (DSI) Control Board (part number LH33WP003) for the Carrier PY3PNA060090NA packaged gas unit. The DSI control board is the nerve center of your system's heating operation — it orchestrates the combustion sequence by controlling the spark igniter and gas valve, managing blower and indoor fan motors, monitoring flame sensing, and enforcing ignition trial timing and safety lockout. When this board fails, typical symptoms include a complete no-heat condition, repeated ignition lockout faults, the furnace firing briefly and then shutting down, or no spark being generated at all despite the inducer running normally.

• Part Number: LH33WP003 (also supersedes LH33WP003A) | Direct Spark Ignition (DSI) microprocessor-based control board | Factory-matched for Carrier PY3PNA060090NA packaged gas units
• OEM vs Generic: This is a genuine Carrier OEM board — not a third-party substitute. OEM boards carry factory-programmed timing parameters, lockout sequences, and fault diagnostics that generic replacements cannot always replicate exactly, preventing nuisance lockouts and preserving your equipment warranty.
• Install Difficulty: 3/5 — Requires disconnecting 24V control wiring, line-voltage blower wiring, and gas valve leads. Always shut off power and gas before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter, phone/camera to photograph all wiring connections before disassembly. Label every connector.
• Warranty: 1-year OEM manufacturer warranty. In stock and ships same business day from our warehouse — no waiting on special orders.

Compatibility: Engineered as the direct OEM replacement for Carrier model PY3PNA060090NA packaged gas heating/cooling units. Also fits other Carrier, Bryant, and Payne rooftop and packaged units specifying part number LH33WP003 or LH33WP003A — verify your unit's data plate and existing board part number before ordering. Our fitment team is available to confirm compatibility before you buy.